Center for Image in Science and Art _ UL
From a Medical Image to a 2D Finite Element Mesh: Modeling the Femoroacetabular Impingement
Author: Daniel Simões Lopes
Date: 2008
Description: A probable etiology of the hip osteoarthritis is the femoro-acetabular impingement, i.e., an abnormal morphological relation between the femoral head and the acetabular cavity that leads to the chronic injury of the most peripheral regions of the joint. The “Cam” type impingement is due to the presence of a non-spherical portion of the femoral head. This asphericity exerts an excessive pressure on the acetabular cartilage during flexural movements and/or internal rotations. Top image: Radial magnetic resonance arthography (rMRA) image with the articular structures segmented and the indication of the centre of rotation of the femoral head and the axes of the anatomical neck. Bottom image: 2-D quadrilateral mesh of the geometric model extracted from the rMRA image, suitable to evaluate the order of magnitude of the pressures at the contact zone of the femoral head as well as the stresses at the cartilages as a result of the abnormal contact between the different tissues.
Source: Lopes, D.S., Simões, F.M.F., Pires, E.B., Rego, P.A., Biomechanical Modeling on the Femoro-Acetabular Impingement of the Cam Type, In: Proceedings of the X International Conference on Computacional Plasticity - COMPLAS X, Barcelona, 2009
Image and caption provided by: Daniel Simões Lopes, ICIST/IST-TULisbon
From a Medical Image to a 2D Finite Element Mesh: Modeling the Femoroacetabular Impingement
Author: Daniel Simões Lopes
Date: 2008
Description: A probable etiology of the hip osteoarthritis is the femoro-acetabular impingement, i.e., an abnormal morphological relation between the femoral head and the acetabular cavity that leads to the chronic injury of the most peripheral regions of the joint. The “Cam” type impingement is due to the presence of a non-spherical portion of the femoral head. This asphericity exerts an excessive pressure on the acetabular cartilage during flexural movements and/or internal rotations. Top image: Radial magnetic resonance arthography (rMRA) image with the articular structures segmented and the indication of the centre of rotation of the femoral head and the axes of the anatomical neck. Bottom image: 2-D quadrilateral mesh of the geometric model extracted from the rMRA image, suitable to evaluate the order of magnitude of the pressures at the contact zone of the femoral head as well as the stresses at the cartilages as a result of the abnormal contact between the different tissues.
Source: Lopes, D.S., Simões, F.M.F., Pires, E.B., Rego, P.A., Biomechanical Modeling on the Femoro-Acetabular Impingement of the Cam Type, In: Proceedings of the X International Conference on Computacional Plasticity - COMPLAS X, Barcelona, 2009
Image and caption provided by: Daniel Simões Lopes, ICIST/IST-TULisbon